Get Bone to track another armature
I Managed to accomplish this through trial and error. First going from the second bone (first child after Node) I added two Constraint's.

First add a "Damped track" and target the same armature as the bone, and target the next bone in the armature, Bone_2 targets Bone_3, 2->3, 3->4.

Second add a "Limit rotation" constraint keep everything default and Limit X, Y, and Z. 

On the last, Tail Node add only 1 Constraint: A "Inverse Kinimatics" Target is Armature 2, Bone x.

After all this the first armature will fallow the second one, keeping its constraints.

EDIT: I made a small mistake the last Bone (Tail) constraint is not a Spline IK, but an Inverse Kinimatics constraint.